Ringo service in India

Ringo calling services has now been started in India and they offer low cost calling to many destinations without the need of the internet. Ringo is like basically making a call using your service provider but the only difference is that the call costs are low cost and through Ringo.
There are so many VOIP services and to top it up there is no Ringo but I think slightly better as there is no need of a data service or WiFi service.
What is left now is testing their service and knowing what the call quality is like.